This workshop service repair manual provides comprehensive information for Volvo Penta Aquamatic Drives, specifically covering models 280, 280DP, 285, 290, and 290DP. These inboard/outboard sterndrive units are engineered for reliable marine propulsion. The manual details the sterndrive gearbox and covers all compatible engine types, ensuring a thorough understanding of the drive system. This manual is designed to assist owners, mechanics, and technicians in maintaining and repairing their Volvo Penta Aquamatic Drives. It includes complete A-Z repair and service procedures, step-by-step instructions with illustrations, diagnostic procedures, troubleshooting guides, and information on parts replacement, lubrication specifications, gasket and seal details, trim and tilt systems, propeller maintenance, cooling systems, and drive unit disassembly and reassembly.